Improved mounting means for glue spreading rollers



J. B. M FALL Jan. 1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADINGROLLERS Filed June 13, 1952 4 Sheets-Sheet l INVENTOR. J05 5. M FALLJan. 1, 1957 J McFALL 2,775,953

IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS Filed June 13, 1952 4Sheets-Sheet 2 INVENTOR. JOE 5. M i/4A L BY .972 v agf J. B. M FALL Jan.1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS 4Sheets-Sheet 3 Filed June 13, 1952 INVENTOR. U05 5. MFA

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J. B. MOF'ALL Jan. 1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADINGROLLERS 4 Sheets-Sheet 4 Filed June 13, 1952 INVENTOR J05 5. M 5444United States Patent=*-C J IMPROVED MOUNTING MEANS FOR GLUE SPREADINGROLLERS Joe B. McFall, Seattle, Wash.

Application June 13, 1952, Serial No. 293,405

17 Claims. (Cl. 118-227) This invention relates generally to gluespreading machines and more particularly to novel structure thereinwhich provides great advantages in the adjustment and removal of therolls thereof.

In the conventional arrangement for the adjustment of the rolls in gluespreading machines, screw adjustment means of more or less simpleconstruction are provided. Such screw adjustment means are inherentlyprone to go out of adjustment while the spreader is in operation. Thisresults in either glue waste when the roller spaclng increases or, lessfrequently, in insuificient glue on the veneer, board or other elementto which glue is being applied when the roller spacing decreases.Similarly, there may be inequalities of spread where one or the other ofa pair of screw adjustment means, as usually provided, goes out ofadjustment.

In addition to the above defect in screw adjustmen means that they tendto goout of adjustment due to the mere vibration of the machinery or forother mechanical reasons, there is still another inherent defect in suchmeans due to the fact that there may be a certain amount of play in thescrew threads per se. Since the criticahty of adjustment may be of theorder of thousandths of an inch, the aforesaid play in the threads maybe enough to seriously impair the adjustment. On the other hand, whilethe play referred to may be of an'order to throw out the adjustment, theover all non-resiliency of such screw thread arrangements risks injuryto -the spreader rolls upon encountering an inordinate thickness ascaused, for example, by a thicker veneer or a double piece of core. Inaddition, in the presently known arrangement, the screw adjustmentmeans, because of their relationship to the glue rolls with which theyare operatively associated, continually become fouled by glue from thesaid rolls.

Furthermore, in the presently known arrangements in glue Spreaders, asingle driving motor is provided'for rotating the spreader rolls as wellas the doctor rolls by means of gear trains mechanically linking thevarious rolls. Accordingly, mounting any given one of the rolls forreplacement or repair entails a comparatively difficult operation. i

In view of the foregoing, it is the general object of the presentinvention to provide novel adjustment means which may be set manuallywith great accuracy at all times and which will retain such settingduring operation of the glue spreader until further manual re-setting bythe operator. 1

It. is another important object of the present invention to providenovel adjustment means which will assurethe avoidance of play found inthe usual screw and nut adjustment arrangements.

It is still another important object of the invention to" provideadjustment means which will keep set 'indefinitely and not go out ofadjustment due to vibration or other causes. i

It is yet another object of the invention to provide a 2,775,953 7Patented Jan. 1, 1957 chosen, yet permits lateral movement of the rollsunder or other parts is avoided.

A further object of the invention is to provide adjustment means basedon gas pressure operation.

Another object of the invention is to provide an arrangement whereby theadjustment means per so will not be subject to fouling by the gluehandled by the rolls of the spreader.

Yet another object of the invention is to provide means for permittingfacile removal of the rolls as well as adjustment thereof.

The foregoing as well as additional objects and features of the presentinvention will be readily apparent from the description of one preferredembodiment thereof given hereinafter with particular reference to theaccompanying drawings wherein:

Figure 1 is a front elevation of a glue spreader having the noveladjustment means and driving means of the present invention;

Fig. 1a is a view taken from the right side of Fig. 1

with the cover removed showing certain chain driving mechanisms.

Flgure 2 is a vertical cross-sectional view of the spreader shown inFigure 1, the section being taken on line H-II thereof;

Figure 3 is an enlarged cross-sectional view of one of the doctor baradjustment cylinders, the section being taken along the axis thereof asindicated by line IIlIlI in Figure 1;

M Figure 4 is an enlarged cross-sectional View of one of the spreaderroll adjustment cylinders, the section being taken along the axisthereof as indicated by line IV-IV in Figure 1;

. Figure 5 is an enlarged elevational view of a bearing and mountingstructure for one of the doctor rolls with -parts broken away to showsome of the details; and

Figure 6 is a diagrammatic representation of the lateral movementspossible for one of the spreader rolls and both the doctor rolls, aswell as a glue hopper associated with one of the latter.

Referring now to the drawings, wherein like reference numerals designatethe same parts throughout the several views, a pair of I-beam elements41 arranged in parallel relationship function as the base for the gluespreader apparatus. Mounted on the base elements 41 in spaced apartrelationship are a pair of upright panel 30 are providde on shafts 127and 129 structure which, while keeping the prppenadjustment members 75and 76 upon which the bulk of the glue spreader structure is mounted asdescribed hereinafter. A pair of lower hollow rods 71 and a single upperhollow rod 72, each attached at the ends thereof to said panel members75 and 76, respectively, complete the main framework of the spreaderdevice. have an additional function which will now appear from thefollowing description.

Mounted upon thepair of rods 71 are a pair of supporting brackets whichin turn support a lower glue hopper 31. Supported to extend within theconfines of this glue hopper by means later to be described are thelower glue spreader roll 29 and the doctor roll 27 operativelyassociated therewith. The shafts 127 and 129 for the two rolls 27 and29, respectively, extend through the side walls of the glue hopper 31.In the case of shaft 127, however, elongate slots 130, best seen in Fig.2, are provided in the walls of the hopper 31 to permit the lateralmovement of the shaft later to be described. Seal rings to prevent gluefrom spilling from the hopper 31 via the apertures in the hopper wallthrough which said shafts extend. Such prevention has particularimportance in the case of elongate slots 130. The ends of the shafts 127and 129 are rotatably supported in roller bearings43mountedin blocks 143slidably The pair of rods 71 mou be we oppos d pairs of L=shanedbrackets 144 by means of cooperating tongue 145 and groove elements 145'provided on said brackets and blocks, respectively. Obviously, thetongue and groove arrangement may be reversed with the former element onthe block 143. and the latter on the bracket 144, if desired. Brackets,144 are secured to the respective panel members 75 and 76 by bolts 151or the like.

An end of the shaft 127 for the doctor roll 27 extends through anaperture 146 in the panel 76 and has mounted on the protruding endthereof a sprocket 3.3. Aperture 146 is preferably in the form of anelongate slot similar to slot 130 and for the same purpose of permittinglateral shifting of shaft 127. On the other hand, the shaft 129. for theglue spreader roll 29 is supported in a similarbearing (not shown).mounted on brackets 147 (one of which is shown in Fig. 2) which arefixedly secured to. the panel 75. Shaft 129 likewise extends throughpanel 75 via an aperture (not shown). Mounted upon the extending end ofthe shaft 129 are flexible couplings 39 which connect this end of the.shaft to. the end of a shaft 132 mounting a sprocket 37. While it is notcontemplated that shaft 129 have any lateral movement, the presence ofthe couplings 39 provide for some leeway in aligning shaft 129 with theshaft 132 which is like.- wise laterally unshiftable due to thepresence. of a flange bearing 153..

The upper glue spreader. roll 28. and the doctor roll 26 associatedtherewith are mounted in a manner similar to that just described.Specifically, the shaft 126 for roll 26 is rotatably supported in a pairof bearings (not shown) similar in structure to hearing 43 and eachsim-. ilarly mounted on one of the panels 75 and 76, respec= tively, forlateral movement by means of blocks 143: and brackets 144 havingcooperating tongue and groove elements 145 and 145'. A sprocket 33 ismounted on the end of the shaft 126 protruding through an aperture (notshown) in, the wall of upper glue hopper 32 and an aperture (not shown)in the panel 76 similar to aperture 146 in panel 75. The shaft 128 forthe spreader roll 28, similarly mounted at its ends by bearings 43'mounted in blocks 148, extends at one end thereof through a verticallyelongate aperture (not shown) in the panel 75 and is coupled by means offlexible couplings 39 to a shaft 154 on which is mounted for rotationtherewith a gear 38. In this case the couplings 39 are necessary toaccomrnodate the lateral displacement of shaft 128; to the extent ofapproximately 2 inches. Gear 38 on the upper spreader roll shaft mesheswith a similar gear 38' mounted on the shaft 152 which is connected bythe flexible coupling 39' to shaft 129 of the lower spreader roll 29 asalreadydescribed. The driving means for the spreader rolls 28: and 29comprises a sprocket chain 134 running gver sprocket 37 and a secondsprocket 137 mounted on a shaft 138. Shaft 1-38 is driven via. a threespeed drive gear box 177 and a reduction gearing assembly 136' by amotor 36. An operator handle 77 permits selection of one of three speedsdelivered by the three speed drive gear box 177 depending upon theoperation desired. That is to say, the amount of glue applied to theglue rolls 28 and 2 9- and hence to. a sheet of veneer W passing there,-between may be grossly adjusted step-wise by altering the relative speedof rotation between the glue rolls 28 and 29. and theirrespective doctorrolls 26 and 27, While the fine adjustment is accomplished bymanipulation of the novel adjustment means of the present inventiondescribed hereinafter. Furthermore, different speeds may be requireddepending upon the characteristics of the. veneers being glued such asits brittleness, for example,

Similar but separate means for driving the doctor. rolls 26 and 27 areprovided on the other side of the framework. Specifically, instead ofintermeshing gears 38 and 38 as described for shafts 128; and 129, asprocket chain 133,, connects the two sprockets 33 and 33"mountedon P QI ding ends of; the doctor roll, shafts IZG-and 127,-

respectively. A second sprocket chain 134 connects a second sprocket 34mounted on the shaft 127 for the lower doctor roll 27, with stillanother sprocket 137 mounted on the shaft 139 of a reduction gearingassembly 135 driven by a second motor 35. In this case, it is notnecessary to have flexible couplings between the shafts 126 and 127 andtheir respective sprockets 33 and 33' since the displacement between thesaid shafts, and their respective sprockets thereon is accommodated bythe fact that spring tighteners 133 and 133", provided for chain 133,take up slack therein and permits stretching thereof, Similarly, aspring tightener 141 in chain 134' allows for relative displacementbetween sprockets 34 and 137'. The spring tighteners as is conventionalmay each comprise a sprocket carried by a shaft mounting which is springbiased to urge the sprocket against its respective chain drive to keepthe same resiliently taut in all normal and displaced positions of thesprockets 33, 33 and 34.

Adjustment means for the laterally movable doctor rolls 26 and 27 andthe laterally movable upper glue spreader roll 28; which are particularfeatures of the present invention will now be described. Each of theafore-. said rolls 26, 27, and 28 is provided with its own adjust-v mentmeans in the form of a pair of cylinders. Thus roll 26 has operativelyassociated therewith, in a manner de-. scribed hereinafter, a pair ofcylinders 3 and 4. Similarly, roll 27 has associated therewith a pair ofcylinders 5 and 6, while roll 28 has associated therewith a pair ofcylinders. 1 and 2. It not being necessary to provide ad-, justabilityof roll 29 since the adjustment between this roll and cooperating rolls27 and 28 may be obtained 'by adjustment of the latter two rolls asclearly indicated in Big. 6; roll 29 preferably has no cylindersassociated therewith. One cylinder of each of the three pairs enumeratedis mounted on panel 75 while the other of each pair is mounted on panel76. As shown in Fig. 1, the. means for each such mounting may comprise aU-shaped bracket 11 which is fastened to panel 75 or 76, as the case maybe, by bolts 111 or the like and has apertures 131 in the reaches 141thereof to. receive the respective cylinder it is to mount. A pluralityof reins forcing rods 142 are preferably provided to extend be. tweenreaches 141.

Since, each of the four cylinders 3, 4, 5, and 6 asso- AIQQ- h he.doctor rolls are identical, a description of cylinder 3, for example,will sufiice to indicate the structure of the cylinders 4, 5, and 6.Cylinder 3 comprises, a cylindrical housing 51 at either end of which isneunted one ofa pair of closure members 52 and 53 to define a space. 61.A liner 50 is provided for the interior surface of the cylindricalhousing 57. A shaft 46 disposed substantially axially of cylinder 3,extends through bushings 5,7, and 58 positioned in apertures 157 and15,8, i espectively, provided in the closure members 52 and 53,respectively. Bushings 57 and 58 are each secured in their respectivepositions by means of screws 52:, and Fixedly mounted upon anintermediate, portion of the shaft 46 for movement therewith is a pistonma n-her 45 adapted to, reciprocatewithin the space 61 with theperipheral edges of said piston riding within the inner surface of liner50. A pair of diaphragms or cup leathers 47 have the edges thereofprotruding from the edgesef said, piston to provide a seal incooperation with proper sealing engagement with the surfaces of themovablfiflshaft 46 upon reciprocation thereof with the piston There areprovided passageways 55. and 56 in the left hand; andrighthand closuremembers 53 and 52, respectively, to. which are connected conduits 66 and67, respectively. These latter condu-itsare connected to a gas pressuresystem which will be described later.

Supportedonthe closure member 53 is a cap member 5 '54; The end of theshaft 46 extending through bushing the liner 50. Bushings 58 carrypackings 44 to assure arm-ass end of shaft- 46 is provided withscrewflthreads 47. Threadedly mounted on the threaded end 47 of shaft 46is an adjusting nut member 8 on which is fixedly mounted for rotationtherewith a circular handle 14. The entire assembly comprising thecylindrical casing 51, the two cap members 52, '53, therefor, and thelast named cap 54 are joined in operative relationship by means of aplurality of .bolts 55 passing through suitable flanges on each of thenamed elements as seen in Figure 4. On the extreme end of the threadedportion 47 of shaft 46 there is provided lock nut means 18 for assuringthat the adjusting nut member '8 does not shift its position along thethreaded portion 47 once it has been manually positioned.

n the other end 49 of shaft 46 there is keyed, to prevent relativerotation therebetween, :a collar 56. Collar 56 is attached to block 143which mounts bearing 43 as described hereinbefore. Thus any displacementof piston 45 in its cylinder is accompanied by equal displacementtherewith of block 143 along its tongue and groove guides 145, 145, andwith it, of course, bearing 43 and shaft 126 supported therein.

It will be apparent that the introduction of fluid pressure into thespace 61 to the left of piston 45, as viewed in Figure 3, will urge thepiston 45 and the shaft 46 therewith (as well as the doctor roll shaft126 mounted in bearings 43 connected thereto) to the right as viewed inFigures 3 and 6 towards upper glue spreader roll 28. It will further beapparent that extent of such movement of shaft 46 and the assemblymounted thereon will be limited by the abutment of the right handsurface of nut memher 8, as viewed in Figure 3, with the surface of capmember 54. It will also be seen that the shaft movement limiting eifectof nut member 3 may be adjustably varied by shifting said nut member 8along the threaded end 47 of shaft 46 in one direction or the other byrelative rotation therebetween. To permit the accurate adjustmentsrequired, calibrated indicia (not shown) are placed around the peripheryof adjusting nut element 8 to cooperate with a pointer 62 fixedlymounted on cap member 54. In an operating embodiment of the invention,the marks may be spaced so that moving one mark represents .012 inchlongitudinal movement of nut 8 on shaft 46. Obviously, other values maybe chosen to suit the particular purpose desired. As statedhereinbefore, lock nut 18 may be manipulated to fix the adjustedposition of nut member 8 on shaft 46.

Glue spreader roll 28 has a pair of cylinders 1 and 2 operativelyassociated therewith which are of similar construction and closelyresemble the cylinder structure of cylinders 3, 4, 5 and 6 asexemplified in the detailed description of cylinder 3 hereinbefore. Thusthe similar elements in cylinder 1 are indicated by the same numeralsused to designate like structure in the other cylinder 3 but with theaddition of primes. The essential difierence resides in the adjustmentstructure mounted on the threaded end 47 of the shaft 46'.

Thus instead of the adjusting nut member 8 with the handle 14 thereon,there is provided a nut member 118 on which is fixedly mounted asprocket 114. Sprocket 114, in turn, functions as a mounting for a capmember 7. Cap member 7 provides a mounting for a ratchet handle 12. Anindicator bar 162, fastened to the main cylindrical assembly by means ofone of the bolts 55', extends to the periphery of the cap member 7 uponwhich suitable indicia may be inscribed as already described for capmember 54 of cylinder 3. It will be noted that while each of thecylinder adjustment means for the doctor rolls 26 and 27 is individuallyadjusted, the adjustment nuts 118 for the two cylinders 1 and 2associated withthe 6 and 115 operatively associated with cylinders 1 and2, re spectively. 1 a

As in the case of shaft 46, shaft 46 has a collar member 156 keyedthereto. A block element 148 is fixed to said collar 156 and carriesbearing 43 for shaft 128 of upper glue roller 128. The bottom of gluehopper 32 is cut out so that the main portion of doctor roll 26 andalmost a quadrant of glue roll 28 is positioned within the hopper asseen in Figures 2 and 6. The side walls of the hopper extend downwardly,however, to the extent indicated in Figure 6, to form with the sidesurfaces of rolls 26 and 28 with which they closely abut, a seal toprevent leakage of glue from the hopper 32. The sealing abutment ofrolls 26 and 28 with the side walls of hopper 32 may be seen in Fig. 1.

Figure 6 shows a diagrammatic representation of the movements of thevarious rolls possible by manipulation of the adjustment means for eachof the associated cylinders. Specifically, glue spreader roll 28 may bemoved towards and away from the lower glue spreader roll 29 and the workW positioned therebetween as indicated by the opposed arrows to assumesuch positions as those indicated by the full line disclosure of roll 28and the dotted line disclosure of the same roll at 28. Similarly, roll27 may be moved towards and away from the roll 29 as indicated by theopposed arrows and the full line and dotted line disclosures 27 and 27'.In the case of doctor roll 26, it will be observed that the glue isconfined in the upper hopper 32 by means of the upper surface of theroll 26 itself and a scraper member 132. Accordingly, since relativemovement between the roll 26 and the scraper 132 would obviously resultin loss of glue between these two elements upon their separation, theglue hopper 32 and the shaft for the doctor roll 26 are mounted as asingle movable unit. Thus, operation of the cylinders 3 and 4 results inmovement of the entire glue hopper and doctor roll assembly in thedirections indicated by the opposed arrows to the positions indicated infull at 26, 126 and 32 and in dotted lines at 26, 126 and 32'.

Movement of the piston in each of the cylinders 1 to 6, inclusive, isobtained in one direction or the other by upper glue spreaderroll 28 maybe operated simultaselective introduction of gas pressure into the spaceat either side of the particular pistons via the conduits 66, 67 in thecases of cylinders 3, 4, 5 and 6 and via 66' and 67 in the cases ofcylinders 1 and 2. In the embodiment of the invention shown, a conduit65 is connected to a pressure source (not shown). Located in suitableconnections between the said conduit 65 and the various pairs ofconduits 66, 67 and 66', 67 for the respective cylinders, there islocated one of the selector valves 22, 23, and 24 whereby fluid pressurefrom conduit 65 may be selectively directed to either of conduits 66 and67 (or 66' and 67') and hence against either side of the piston withinthe cylinder to which said pairs of conduits are connected. A pressurereducing valve 25 is located in each of the conduits 66' leading to thespaces 61 of cylinders 1 and 2 at the side of the piston 45 which is onthe same side as the screw threaded adjustment means. Thus the maximumpressure which may be applied against the upper faces of faces ofpistons 45' is limited to a desired value, such as 10 lbs. per squareinch, by way of example only. Such desired value will keep the roll 28in proper adjustment but permit raising of the same by abnormalthickness in or on the Work W which may inadvertently contact them. Inother words the gas pressure at a limited value affords a cushioningresiliency to the roll 28 under extraordinary circumstances but assumesproper and positive adjusted positioning during normal operatingconditions. In the case of the rolls 26 and 27, which do not contact thework W, and hence are not subjected to the same probability ofencountering variations in thickness, no pressure reducing values areinthe pistons in both the operative position as well: as; in:

the inoperative position, instead: ofonlyv inthe latter.

Themechanism so; far described when not in use, willhave, the valves 22,23, and 24'turned to. their rezsp ective positions whereby conduit: 65-leading from the pressure source will be connected into. each of the;con-. duits 67' (and, conduits-67). Thus, the full .line pressure willbeappliedagainstthat surface of eachofthepistons; 45 and 45; to urge,them-toward-the endof chambers. 61., and 61; which are closer toathe.adjustment means whereby the. shafts46 and 46' and.theibearingassemblies48,.and 48'. attachedthereto move. to.- withdraw each'of theurolls .26,2,7 and 28, from theparticular;rolLadjacent plicated gearinginterconnections between the two sets of.

rolls as conventionally provided to present problems of removing a givenone or others of the rolls.

With the rolls in the withdrawn, position stated, the glue. hoppers 31,32 may be supplied with glue and the adjustment means for eachof the.rolls manipulated. Specifically, for adjustment of the, gluev spreaderroll 28, ratchet handle 12 may be manipulated to rotate cap 7 ofcylinder 1, and with it, sprocket 114-and nut member 118 whereby thelatter, rotating on the screw threadsat,,the end 47 of shaft 46', iscaused to shift its. position thereon to the one-chosen by the operatorof the device; That is, the cap 7 is caused to rotate so that theparticular indicia thereon (which designates the desired adjustmentofthe roller. 28 when in operative position) coincides with the pointer62. Due to the sprocket chain connection 13 between the'sprockets 114-of cylinders 1. and, 2, respectively, nut 118 is caused. to be shiftedto .the same relative position on shaft 46 of.

roll 28 .relative. to spreader roll Bend the work passing therebetweenwill be equal throughout the lengths of the. .said rolls. Due to theinterconnection of the adjust ment meansfor cylinders 1 and 2, each-ofthe former acts-as check means, to. prevent the going out of adjustmentof the other except upon positivemanipulation of ratchet handle 12.. asalready described.

In regard, to the adjustmentof the .doctor. rolls 26. and,.2,7, each ofcylinders 3, 4,- 5 and 6 has its own separatelymanipulated adjustmentmeans. Thus, each of 'the adjusting; nut members 8 is givenits desiredrelative,position along the screw threadcd end 47 of its rcspectiveshaft 46 .by rotation of such nut member by means of handle 14. Sincethe mutual checkingaction between pairs of adjustment means as describedfor cylinders 1 and 2.is lacking for the separately adjusted cylinders3,. 4, 5 and 6; lock nut members 13-rnay be tightenedupon adjustingnutsd after the latter has been positioned as desired so that axialshifting thereot' is preventedwhen the shaft 46gis shiftedto theoperative valves 22 and 24 to connect conduit 65 with the conduits66-1015 therespeetivelcylinders 3, ,4, ..5. and.6; may-then. be;

donea Withzthe: rolls;26, 27 and..28-in operativeposition and": underproper: adjustment, andzthe. veneer W in-position. between-rolls28andz29, the separaterdriving means-35.- and 36. may, be renderedoperative (by manipulation of suitable. switchesnot shown): whereby allthe rollswill'.

be driven by the; sprocket and sprocket chain. assemblies 1 describedpreviously. The-veneer W is.caused to movein; the direction ofthe=-horizontally disposed arrow upon! rotation" of rolls 28 and 29-invthedirection of the-curved arrows Cooperatingrg uide elements 159 and160, be-- tween which therveneer W moves,.assure theproperposi-r tioningof the latter at the feeding'end whileagrate: 1611 guidesthe-veneerover. glue; hopper: 31 after application of. glue by thecrolls28 and 29;

The .chosen' adjustment will .benmaintained !without any;

variation. -.due to the. positive and constant action .of the fluid.pressurewhich-causes, via; the pistons :and shafts' on whichtheyaremounted, all slaekibetween: the threads ofthe-shaftends 47 and 0fthe nut-members :81'and 118;

to be eliminated. However,,due.to=the.inclusion.:of the reducing, ,valve25'for. limitingthepressure in conduits 66 and. hence. against theupperv surface of each of pistons-.-45.' incylinders 1 and 2,respectively, the positive adjustment-of glue roller 28vis yieldable tothe extent of. accommodating gforrexcessive thickness in the work W- orthe: like. In. suchmanner, damage to the roller28 is obviatedwhile thedesired positiveness and constancy of. adjustment: is notsacrificed.

Preferably, .outletmeans are provided for the lower gluehopper 51. Suchmeans may comprise a simplepipe 73. connected into theibottom of hopper31 and controlled by a valve. 74.. The. end of pipe 73.preferably may be1 on said hopper.. 40"

positioned. over a spill-over hopper 40 which extends. forsubstantiallyuthe dimensions of the framework whereby all sp'illageiscollected. Upper glue hopper 32. may: be emptied by removing scraper 132from its mounting In the embodiment of theinvention shown, thedischarged. glue will findits way intolower hopper Bland thence .viapipe73 to the spill-over hopper 40,- vif desired.

It will be apparent. to those skilled in the. art thatvarlousmodifications andembodiments of the above described'invention maybe resorted to without departing from the spirit of the invention andthe scope of the claims appended hereto.

For example, the spreader apparatus might be used to apply materialother than glue upon appropriatework. in those cases where an accurate,foolproof, and/ or foulproofadjustment of the amount. of materialspread. is desirable. by the use of gas such'as air, or the like, as thepressure medium for actuating the pistons in the cylinders because of.the inherent characteristic of resilience of such. media; in someinstallations, the employment of some other fluid pressuremedium, e. g.,water or oil, may be suitable.

What I claim (is:

l. Inaglue spreader, a roll for accommodatinga film of glue thereon,means rotatably mounting said roll, a hollow'cylinder, a' shaft passingthrough said hollow cylinder," means connecting one end of said shaft tosaid' inderand mounted on said shaft for movement therewith, meansforintroducing fluid pressure into said hollow cylinder. selectively ateither end'of said piston for moving thesame and .the shafttherewithineither direction, acap" covering onezendof said hollow cylinder,meanslimiting themovement of saidshaft at least in one direction bycontacting ,said' cap; and. screw means mounted on. the-other end of.said. shaft. for adjusting the etfect of said. limiting means.

2. Ina-gluespreader, a roll. for accommodatingz a film".- of gluethereon, means rotatably mounting said roll, a

Also while superior results are obtained.

in said cylinder, a shaft passing through said space and said endclosure members, means connecting one end of said shaft to said mountingmeans, a piston movable in said space and mounted on said shaft formovement therewith, means for introducing fluid pressure into said spaceselectively at either end of said piston for moving the same and theshaft therewith in either direction, means limiting the movement of saidshaft at least in one direc tion, said means comprising first abutmentmeans longitudinally adjustably mounted on the other end of said shaftand cooperating second abutment means mounted for engagement by saidfirst adjustable abutment means after a predetermined amount of movementof said shaft in said one direction depending upon the relativepositioning of said adjustable abutment means along the length of saidother shaft end said second abutment means comprising a cap covering oneend of said hollow cylinder.

.3. In a glue spreader, a roll for accommodating a film of glue thereon,means rotatably mounting said roll, a hollow cylinder, end closuremembers enclosing a space in said cylinder, a shaft passing through saidspace and said end closure members, a cap covering one of said endclosure members, means connecting one end of said shaft to said mountingmeans, a piston movable in said space and mounted on said shaft formovement therewith, means for introducing fluid pressure into said spaceselectively at either end of said piston for moving the same and theshaft therewith in either direction, means limiting the movement of saidshaft at least in one direction, said means comprising first abutmentmeans threadedly mounted on the other end of said shaft and cooperatingsecond abutment means comprising said cap mounted for engagement by saidfirst abutment means after a predetermined amount of movement of saidshaft in said one direction depending upon the relative positioning ofsaid first abutment means along the length of said other shaft end, andoperating means mounted on said first abutment means for rotating thesame on said shaft.

4. In a glue spreader, a roll for accommodating a film of glue thereon,means rotatably mounting said roll, a hollow cylinder, end closuremembers enclosing a space in said cylinder, a shaft passing through saidspace and said end closure members, a cap covering one of said endclosure members, means connecting one end of said shaft to said mountingmeans, a piston movable in said space and mounted on said shaft formovement therewith, means for introducing fluid pressure into said spaceselectively at either end of said piston for moving the same and theshaft therewith in either direction, means limiting the movement of saidshaft at least in one direction, said means comprising first abutmentmeans threadedly mounted on the other end of said shaft and cooperatingsecond abutment means comprising said cap mounted for engagement by saidfirst abutment means after a predetermined amount of movement of saidshaft in said one direction depending upon the relative positioning ofsaid first abutment means along the length of said other shaft end, anda sprocket wheel mounted on said first abutment means and adapted to beengaged by a sprocket chain whereby said first abutment means may berotated by movement of said chain.

5. In a glue spreader, a roll for accommodating a film of glue thereon,means rotatably mounting said roll, a hollow cylinder, end closuremembers enclosing a space in said cylinder, a shaft passing through saidspace and said end closure members, a cap covering one of said endclosure members, means connecting one end of said shaft to said mountingmeans, a piston movable in said space and mounted on said shaft formovement therewith, means for introducing fluid pressure into said spaceselectively at either end of said piston for moving the same and theshaft therewith in either direction, means limiting themovement of saidshaft at least in one direction, said means comprising first abutmentmeans threadedly mounted on the other end of said shaft and cooperatingsecond abutment means comprising said cap mounted for engagement by saidfirst abutment means after a predetermined amount of movement of saidshaft in said one direction depending upon the relative positioning ofsaid first abutment means along the length of said other shaft end, andsprocket means restraining at least in one direction the horizontalmovement of said first abutment means on said shaft end.

6. In a glue spreader for wood veneers, a roll for accommodating a filmof glue thereon, means rotatably mounting said roll, a pair of hollowcylinders, a shaft passing through each said hollow cylinder, meansconnecting one end of each of said shafts to a difierent portion of saidmounting means, a piston movable in each of said hollow cylinders andmounted on each of said shafts for movement therewith, means forintroducing fluid pressure into said hollow cylinders selectively ateither end of said pistons for removing the same and the respectiveshafts therewith in either direction, caps covering one end of saidhollow cylinders, positive screw means limiting the movement of saidshafts in only one direction, said screw means mounted on the other endof each of said shafts for adjusting the effect of said glimiting meansby contacting said cap, and means for manipulating said screw meanssimultaneously.

7. In a glue spreader, first and second rolls for accommodating films ofglue thereon, said first and second rolls being arranged substantiallyone above the other, first and second means rotatably mounting saidfirst and second rolls, respectively, a hollow cylinder, a shaft passingthrough said hollow cylinder, means connecting one end of said shaft tosaid first mounting means, a piston movable in said hollow cylinder andmounted on said shaft for movement therewith, means for introducingfluid pressure into said hollow cylinder selectively at either end ofsaid piston for moving the same and the shaft therewith in eitherdirection towards and away from said second roll, cap means positionedover one end of said hollow cylinder and limiting the movement of saidshaft in the direction towards said second roll, and screw means mountedon the other end of said shaft for adjusting the effect of said limitingcap means.

8. In a glue spreader, first and second glue spreader rolls, first andsecond doctor rolls each adapted to engage the respective one of saidfirst and second glue spreader rolls, separate means each rotatablymounting one of said rolls, three separate pairs of hollow cylinders, aseparate shaft passing through each one of said hollow cylinders,respectively, means connecting one end of each of said shafts of eachpair of said cylinders to each one of three of said mounting means, apiston movable in each of said hollow cylinders and mounted on theassociated one of said shafts for movement therewith, means forintroducing fluid pressure into each of a pair of said hollow cylindersselectively at either end of each of the pair of said pistonsoperatively associated therewith, re spectively, for moving the same andthe shafts therewith in either direction towards and away from at leastone other roll, cap stop means limiting the movement of each of saidshafts at least in one direction, and screw means mounted on the otherend of each of said shafts for adjusting the effect of said cap stoplimiting means.

9. In a glue spreader, first and second glue spreader rolls, first andsecond doctor rolls each adapted to engage the respective one of saidfirst and second glue spreader rolls, separate means each rotatablymounting one of said rolls, three separate pairs of hollow cylinders, aseparate shaft passing through each one of said hollow cylinders,respectively, means connecting one end of each of said shafts of eachpair of said cylinders to each one of three of said mounting means, apiston i with, valve means for introducing fiuid pressure simultaneouslyinto each of a pair of: said. hollow: cylinders selectively at. eitherend of each.of.the:pair ofzsaid pistons operatively' associated.therewith, respectively; for moving the same and the'shaftstherewithzineither di-' rection towards andaway from at least:one-other'rolhcap stop means limiting the movement of'each': of saidshafts at least in one'direction, and-screwmeansmounh ed on the otherend of'each of said shafts for. adjusting the effect of said capstoplimitingmeans.

10. In a glue spreader; first and-second glue spreader rolls, first andsecond doctor rolls each adapted to engage the respective one of saidfirst and second glue spreader rolls, first glue hopper means-forsupplyingzglue to said first doctor roll and. mountedv for movementtherewith, separate means eachrotatablymounting one of said rolls, threeseparate pairs of hollowcylinders, a separate shaft passing through eachone of said hollowcylinders, respectively, means connecting. one end ofsaid shafts of each pair of said cylinders to each one of three of saidmounting means, a piston movable in and screw means mounted on the otherend of eachofv said shafts for adjusting the effect of said cap limitingmeans.

ll. In a glue spreader, first andsecond glue spreader rolls, first andsecond doctor rolls each adapted to engage the respective one of saidfirst andsecond glue spreader rolls, first glue hopper meansforsupplying glueto said first glue spreader and doctor rolls, second gluehoppermeans for supplying glue to said second glue spreader and doctorrolls, separate means each rotatably mounting.

one of said rolls, three separatepairs of hollow cylinders,

a separate shaft passing througheach one of saidhollow cylinders, meansconnecting one end of said shafts of each pair of said cylinders to eachoneof said mounting'mea'ns for said doctor rolls and to said mountingmeans for said first glue spreader. roll, said second gluez spreaderroll being mounted within the confines of said second. glue hoppermeans, a piston movable in each said hollow cylinder and mounted on theassociated one. ofi-said-shafts for movement therewith, valve means: forintroducing fluid pressure simultaneously into each. ofiapair ofnsaidhollow cylinders selectively atleither endofeachof'the.

pair of said pistons operatively associated therewith. for moving thesame and the shafts .therewithrin-either direction towards and away fromat least one otherrolhcap means limiting the movement of each of saidshafts at least in one direction, and screw means mounted ontheother endof each of said shafts for adjusting-theeifect of said cap limitingmeans.

12. In aglue spreader as set forth in claim ll inwhich.

chain means are interconnected'with said screw'means for adjustment ofone of said rolls so that'b'othsides of said roll will be the same andrestrainedfrom getting out of adjustment.

13. In a glue spreader as set forth in claim-llv wherein a pressurereducing valve is operatively associated with one side of a pair of saidhollow cylindersso.that alowpressure against said pistons willmaintainthe positive adjustment While 'yieldablewhen'work of excessthickness passes between said 'spreader'roll's;

14. In a glue spreader as set forthiin=claim" 1'l wherein said firstglue spreader roll is mounted only partially within the confines of saidfirst'gluehopper and movable therewith as a'unit;

15; In a spreader apparatus, first and second spreader" rolls, first andsecond doctor rolls'each'adapted to'engage the respective one of saidfirst and second spreader rolls,

separate-means each-rotatably mountingone of said rolls; threeseparatezpairs' of. hollow-cylinders, a separate'shaft passing througheach one of said'hollow cylinders, re-

spectively,,means' connectingoneend-of said shafts of each pair of saidcylinders to eachone-of three of'sa'id mounting. means, a pistonmovablecin each said hollowcylinder and mounted on the associated-oneofsaid shafts for movement therewith, valve means for introducingfluidpressure simultaneously into each of a'pair of said hollowcylinders selectively at either endlof each of the pair of said pistonsoperatively associated therewith for moving the same and the shaftstherewith ineither direction towards and away from atleast oneotherroll, means limiting the movement of'each of said shafts at least inonedirection, screw means mounted on the other end of each of said shaftsfor adjusting the effect'of said limiting means, pressure reducing meansfor yieldably' holding said spreader roll, and means: for limiting themovement of each said screw means alongvitsrespective shaft at least inone direction.

16. In a glue spreader for wood veneers, first and second glue spreaderrolls, variablerspeed'drivingmeans for said spreader rolls, first andsecond. doctor rolls-each adapted to engage the respective one of:saidfirstsand second glue spreader rolls and arrangedxso that the axisvpassing through the centers of the first glue spreader roll and doctorroll is at an'angle to the axis passing through the centers of thesecond glue spreader roll and doctor roll, variable speed drivingmeansfor said'doctor. rolls. separate and independent from saidfirst.mentioned'driv-'- ingv means, first glue hopper means forsupplying. glue to said first glue spreader anddoctor rolls, secondglue, hopper means for supplying-glue to said glue spreaderrand,

doctor rolls, separate means each rotatably mountingone of said rolls,three separate pairs of hollow cylinders, a separate shaft passingthrough each one of said hollow cylinders, means connecting one endof'said shafts of each pair of said cylinders to each one of saidmounting means for said doctor rolls and to said mounting-means for saidfirst glue spreader roll, said first glue spreader roll being mountedonly partially within thev confines of said first glue hopper andmovable therewith as a unit, said second glue spreader roll beingmounted within the'confines of said second glue hopper means and movableindependently thereof, a pistonmovable in each said hollow cylinder andmounted on the associated one of said-shafts for movement therewith,valve means for introducing fluidpressure simultaneously into each of apair of saidhollow cylinders selectively at either end of' each ofthe-pair of said pistons operatively associated therewith for moving thesame and the shafts therewith in either direction towards and away fromat least one other roll, means limiting the movement of each of saidshafts at least in one direction, screw means mounted on the other endof each of said shaft for adjusting the effect of said limiting. means,chain means interconnectingsaid screw means for adjustment of one ofsaid rolls. so thatboth sides of said. roll will be thesameandrestrained from getting out of adjustment, and a pressure reducingvalve operatively. as-

sociated with onesideaof a pair of said hollow cylinders whereby a lowpressure. againstsaid pistonswill maintain the positivev adjustmentwhile. yieldablewhen work of excess thickness passes between saidspreader rolls.

17. In a glue spreader, first andsecond' glue spreaderrolls, first andsecond doctor rolls each adaptedto. en-

gage the respective one of said first andsecond glue spreaderv rolls,first. glue hopper means for supplyingglue to said.firstgluelspreader.and doctor rolls, second glue hopper. means. for supplying; glue: tosaid secondglue spreader and doctor rolls, .separatesmeanseachrotatably' mounting one. of: said rolls, hollow cylinders a: separate:

shaftapassing through each one of said holl'ow cylin'ders;

means connecting one end of said' sh'afts o'f' said cylinders to eachone of said mounting means forsaid doctor rolls and to said mountingmeans for said first glue spreader roll, a piston movable in each saidhollow cylinder and mounted on the associated one of said shafts formovement therewith, valve means for introducing fluid pressuresimultaneously into each hollow cylinder selectively at either end ofsaid pistons operativeiy associated therewith for moving the same andthe shafts therewith in either direction towards and away from at leastone other roll, means limiting the movement of each of said shafts atleast in one direction, screw means mounted on the other end of each ofsaid shafts for adjusting the effect of said limiting means, and apressure reducing valve operatively associated with one side of a pairof said hollow cylinders whereby a low pressure against said pistonswill maintain the positive adjustment while yieldable when work ofexcess thickness between said spreader rolls.

References Cited in the file of this patent UNITED STATES PATENTS VuonoJuly 20, 1920 Massey Mar. 25, 1941 Fluckinger Oct. 10, 1944 Coates Apr.10, 1945 Nordquist Mar. 5, 1946 Muggleton et al Apr. 23, 1946 Muggletonet al Apr. 23, 1946 Taylor Nov. 22, 1949 Perry et al. Aug. 5, 1952 HoelAug. 12, 1952

